Duplex pump



Aug. 30, 1927.

K. F. GER HARD 1501mm! PUMP Filed Jan. '25. 192 2 Sheets-Sheet 1 m n a m 9 Aug. 30, 1927.

- 1,640,402 K. F. GERHARD v DUPLEX PUMP Filed Jan, 25. 1926 2 Sheets-Sheet 2 ll Y I |,.|.L....1.L| Q r y o m J I; a I 9mm! I Aar/F Gerhard Patented Aug. 30, 1927.

KARI r. ennnann, OFY-HQA'ITON, wasnmsron.

' r DUPLEX rum. 7

Application filed January 23, 1926. Serial No. 88,281.

My present invention relates to an improved duplex pump of the lifttypeembodying oppositely moving duplex vertically reciprocating pump tubes and rods.-

Means are providedwhereby the duplex pumping parts are well balanced and supported and the vertically reciprocating pump rods are arranged to performtheir working strokes or lift strokes in advance of the upward movement of the tubes of the pump. Provision is also made for guidlng the oppositely reciprocating parts of thepump for maintaining the parts in alinement and a compact arrangement of motor and operating parts is provided for actuating the pump mechanism with regularity and uniformity. The invention consists in certain novel combinations and ments of parts as will hereinafter be more specifically pointed out and claimed. the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and'arranged in accordance with the best mode I have thus far devised for the practical application of the principles of my invention. 1

Figure l is a View in elevation showing the duplex pump mechanism in operative position with relation to a well. g V

Figure 2 is a similar view taken at right angles to Figure 1 showing also the motor;

pump jack and connections.

Figure 3 is a top plan view of the pump as seen in Figure 2.

Figure a is an enlarged detail view-showing an adjustable, oscillatingguide or cross head for the pump tube cables.

Figure 5 is an enlarged detail view of one of the connections between the pump jack and pump rod;

Figure 6 is. a perspective View of a portion of the oscillatable' cross head or guide for the cables.

In carrying out the principles of my in-;

vention, and as shown in the drawings wherein a preferred form of the invention is used, the oppositely reciprocating duplex pump parts are flexibly suspended in a well W to alternately lift the column of Water to the surface. Each of these pump devices comprises a pump tube as 1 and 2 having pump cylinders 3 and 4 at their lower ends which are submerged in the water or other liquid. As the pump tube rises water is inducted through th lower end of the cylpurpose at the surface level.

are suspended by arrangeinder by suction and as the pump tube rises a column of water is lifted or elevated and pours out through an eduction port or spout 5 which empties the water" into a tank or trough 6 located in proper position for the These pump tubes means of flexible cables 7 and 8 over two grooved oscillating pulleys 9 and 10 on the single shaft 11 which is journaled in bearings 12 at thetop of the frame 13.

The cables are located at opposite sides of. the tubes andv the complementary ends of the two cables are attachedto a single or sectional collar 14, one of which is clamped on each tube in the proper location. "The parallel cables pass up and over-their respective pulleys to provide an overhead flexible support in order that the tubes may freely reciprocate in opposite directions. To maintain the tubes in vertical position,

a fixed bracket 15 is provided for each tube,

the bracket being attached to the frame 13 and fashioned with a guide sleeve 16 table guide or cross head comprises a hub section 17 journaled-to oscillate on the pin 18 which is supported by brackets on the frame 13. The central portion or hub of the cross head is fashioned with a pair of arcuate end plates 20 each of which is fashioned withtwo pairs of alinedlongitudinal slots 21, 21. At the outer sides of these end plates are attached the guides for the cables-each'of which includes a pair of spaced arcuate and grooved-segments 22 and 23, each segment being fashioned with an inner attaching flange 24 with two holes for attaching bolts 25. The bolts are passed through the holes and through registering slots 21 in order that the guide segments may be adjusted to required position with relation to the oscillating guide pulleys 9 and 10 and the connections to sleeves 14 of the ends of the cables. For a larger tube than illustrated in Figure 2 of the draw- 26 and 27, is provided to reciprocate and valved pistons are employed on the ends of the rods in the cylinders of the tubes to induct water into the cylinders and elevate the column of water by the reciprocal action of the rods.

The rods are also suspended by a flexible connection as a chain or cable 28 with its ends attached at 29 to the rods. The chain or cable is suspended over an oscillatable wheel 30 on the shaft 11, and guide brackets 31 at the top of the frame 13 hold the rods in alincment and guide them in their reciprocal movement. As the wheel 30 is larger in diameter than the pulleys 9 and 10, it will be apparent that the greater leverage afforded by the difference in size of the wheels will cause the pump rods to move in advance of the reciprocal movement of the tubes for the purpose of lifting the column of water in the reciprocating tubes as they alternately move up and down in opposite directions.

For operating the duplex pump I employ a motor as 32 having balanced fly wheels 33 on the ends of the motor shaft 34:, and the shaft is provided with a small pulley 34 connected by belt 35 with the larger driven pulley 36 on the counter shaft 37 which is journaled in bearings 38 of the motor frame A pump jack is operated by the motor for the transmission of power to the duplex pump and said jack comprises a pair of complementary crank wheels 40 on the shaft with pitmen tl pivoted thereto and to the pair of levers 42. levers are bifurcated or forked as at 43 for co-action with a pin 4A carried by the sleeve 45 on each pump rod and a set screw or bolt 46 is utilized to secure the sleeves in adjusted position on the pump rods. The oump levers 42 are pivoted at a7 each to an upright or post l3 rigid with the motor I frame. Thus it will be apparent that the rotary motion of the motor is transformed into reciprocating motion of the pump rods The free ends of these.

through the pump jack. The balanced rods are reciprocated in opposite directions and by their movement the shaft II and pulleys 9 and 10 are oscillated for the purpose of reciprocating the two pump tubes in oppositedirec'tions, the weight of the pump tubes causing a frictional drag of the cables 7 and 8 to move the cables with the pulleys. Having thus fully described my inven tion, what I claim as new and desire tov secure by Letters Patent is r- 1. The combination in a duplex pump with an oscillating shaft having a large pulley andtwo smaller pulleys thereon, of a pair of vertically reciprocable pump tubes and flexible cables suspending said tubes on the smaller pulleys, a pair of pump rods in 3. The combination with a pair of oppositely reciprocable pump tubes, an oscillatable support and a flexible suspending member on said support connected to said tubes, of-

an oscillatable hub, and adjustable guide plates on said hub for co-action with said member.

4. In a duplex pumping mechanism the combination with a pair of oppositely reciprocating pump rods and a pair of com .plementary pump tubes, an oscillatable large pulley and a pair of shaft having a smaller pulleys thereon, a pair of chains connected at their ends to said pump rods and suspended over said smaller pulleys and a chain connected at its ends with said rods and suspended over the larger pulley, means for guiding the pump rods, fixed guides for the pump tubes, and an oscillatable guide for co-action with the chains of thepump tubes.

In testimony whereof I allix my signature.

KARL r. (manner). 

